Okay you see, "مقال" is the normal tal5ee9 while in the case of the letter you should write the receivers address and an intro and body and then a conclusion thanking the receiver for reading your views as the letter, according to my teacher, is always formal. Next comes the speech, here you should, obviously, write a speech about the main points of both articles. Finally the story, you should take all the points and build up a story from the points just like what you do in paper 2. Good luck ! Feel free to ask any questions !